<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区 -->
      <div class="avatar_box">
        <img src="../assets/logo.png"
             alt="avatar" />
      </div>
      <!-- 登录表单 -->
      <div>
        <el-form ref="loginFormRef"
                 :model="loginForm"
                 :rules="loginFormRules"
                 label-width="60px"
                 class="login_form">
          <el-form-item label="账号"
                        prop="username">
            <el-input v-model="loginForm.username"
                      prefix-icon="iconfont icon-user"></el-input>
          </el-form-item>
          <el-form-item label="密码"
                        prop="password">
            <el-input v-model="loginForm.password"
                      type="password"
                      prefix-icon="iconfont icon-3702mima"></el-input>
          </el-form-item>
          <el-form-item class="btns">
            <el-button type="primary"
                       @click="login">登录</el-button>
            <el-button type="info"
                       @click="resetLoginForm">重置</el-button>
          </el-form-item>
        </el-form>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      loginForm: {
        username: "admin",
        password: "123456",
      },
      // 表单验证
      loginFormRules: {
        username: [
          { required: true, message: "请输入用户名", trigger: "blur" },
          {
            min: 2,
            max: 10,
            message: "长度在 2 到 10 个字符",
            trigger: "blur",
          },
        ],
        password: [
          { required: true, message: "请输入用户密码", trigger: "blur" },
          {
            min: 6,
            max: 18,
            message: "长度在 6 到 18 个字符",
            trigger: "blur",
          },
        ],
      },
    };
  },
  methods: {
    // 表单重置按钮
    resetLoginForm() {
      // console.log(this)
      // resetFields：element-ui提供的表单方法
      this.$refs.loginFormRef.resetFields();
    },
    login() {
      // 表单预验证
      // valid：bool类型
      this.$refs.loginFormRef.validate(async (valid) => {
        // console.log(valid)
        if (!valid) return false;
        // this.$http.post('login', this.loginForm): 返回值为promise
        // 返回值为promise，可加await简化操作 相应的也要加async
        const { data: res } = await this.$http.post("login", this.loginForm);
        console.log(res);
        if (res.code !== 200) return this.$message.error("登录失败");
        this.$message.success("登录成功");
        // 1、将登陆成功之后的token, 保存到客户端的sessionStorage中; localStorage中是持久化的保存
        //   1.1 项目中出现了登录之外的其他API接口，必须在登陆之后才能访问
        //   1.2 token 只应在当前网站打开期间生效，所以将token保存在sessionStorage中
        window.sessionStorage.setItem("token", res.data);
        // 2、通过编程式导航跳转到后台主页, 路由地址为：/home
        this.$router.push("/home");
      });
    },
  },
};
</script>

<style lang="less" scoped>
/* // lang="less" 支持less格式
// scoped vue的指令，只在当前组件生效 */
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 360px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  -webkit-transform: translate(-50%, -50%);
  background-color: #fff;

  .avatar_box {
    width: 130px;
    height: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}
.login_form {
  position: absolute;
  bottom: 60px;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
.btns {
  display: flex;
  justify-content: center;
}
.info {
  font-size: 13px;
  margin: 10px 15px;
}
</style>
